WO2022223930A1

WO2022223930A1 - Snap-fitting connecting device with improved tensile strength

Info

Publication number: WO2022223930A1
Application number: PCT/FR2022/050756
Authority: WO
Inventors: Adrien PLEUHS; Boris Marie Frédéric Goisque
Original assignee: Bontaz Centre R & D
Priority date: 2021-04-21
Filing date: 2022-04-21
Publication date: 2022-10-27
Also published as: FR3122225A1; EP4327002A1

Abstract

The invention relates to a connecting device (D) between a first component and a second component, comprising: a male part (M) and a female part (F), the male part (M) being intended to be inserted into the female part (F) along a first direction (Z), the male part (M) comprising a snap-fitting portion (P2) and a guiding portion (P1) downstream of the snap-fitting portion (P2) in the direction of insertion of the male part (M) into the female part (F), the female part (F) comprising a snap-fitting portion (P4) and a guiding portion (P5) downstream of the snap-fitting portion (P4), the male part (M) and the female part (F) being such that the guiding portions (P1, P5) guide the male part (M) in the first direction before the snap-fitting portions (P2, P4) engage with one another.

Description

Title: CONNECTION DEVICE BY CLIPSING PRESENTING A TENSILE STRENGTH

IMPROVED

TECHNICAL FIELD AND PRIOR ART

The present invention relates to a device for connecting by clipping between two parts having improved tensile strength and to a hydraulic distributor comprising at least one such device.

There are different devices and techniques for linking two elements. Hooping provides very good mechanical strength. It mainly applies to steel parts and requires the application of a certain temperature which can damage part of the assembled elements. In addition, the implementation of hooping requires special equipment.

Hot riveting is suitable for parts made of plastic material, however the redesign of a part made of plastic material can cause problems with the resistance of the materials and the effort required for shaping can damage the peripheral parts.

The implementation of riveting also requires special equipment.

Joining by clipping or snapping ensures an assembly based on the elastic deformation of the parts during assembly. In general, one of the parts to be assembled has two branches and the other part has a through bore. The two branches pass through the bore while deforming elastically and return to a substantially undeformed position when their ends emerge from the bore. Assembly by clipping does not require specific equipment, but it generally offers a tensile strength which is not sufficient for certain applications, for example in distributors for cooling circuits in the automotive field.

DISCLOSURE OF THE INVENTION

It is therefore an object of the present invention to provide a connecting device between two parts that does not have the above drawbacks, offering resistance to increased axial stress and easier assembly. The object stated above is achieved by a connection device between two parts, for example as described below, comprising a male part and a female part, the male part cooperating with the female part so, on the one hand , to elastically deform the female part during its insertion into the female part and, on the other hand, to be guided axially downstream of the clipping zone, in the clipping direction, throughout the clipping phase facilitating assembly . This connection offers very good resistance to axial stress.

In other words, each of the male and female parts comprises a part participating in clipping and a part participating in the relative axial guidance of the male part and of the female part.

Thus, by guaranteeing the axial displacement between the male part and the female part, the assembly phase is facilitated and the connection is made more robust.

Preferably, the male part comprises a stem downstream of its clipping part and the female part comprises a bore downstream of its clipping part receiving the stem of the male part, the bottom of the bore and the free end of the rod are such that they cooperate when the clipping phase is completed, securing the connection.

One of the objects of the present application is a connecting device, for example as described above, between a first part and a second part intended to be stressed in a first direction comprising:

- a male part intended to be integral with the first part and a female part intended to be integral with the second part, the male part being intended to be inserted into the female part along the first direction,

- the male part comprising at least one guide portion and one clipping portion, the guide portion being arranged downstream of the clipping part in the direction of insertion of the male part into the female part,

- the female part comprising a guide portion and a clipping portion, the guide portion being arranged downstream of the clipping part in the direction of insertion of the male part into the female part,

- the male part and the female part being configured so that the guide portions cooperate with each other and provide guidance in the first direction of the male part before the clipping portions cooperate with each other.

Such a connecting device may comprise a first shoulder which connects the guide portion (PI) of the male part (M) and the clipping portion (P2) of the male part (M).

For example, the clipping portion (P2) of the male part (M) comprises a chamfer bordering the first shoulder, the chamfer tapering in the direction of the guide portion (PI) of the male part (M).

According to another embodiment, a connecting device according to the invention may comprise a chamfer which connects, preferably directly, the guide portion (PI) of the male part, or the diameter of this guide portion, and the clipping portion (P2) of the male part, or the diameter of this clipping portion.

In an advantageous embodiment, the guide portion of the male part comprises a cylindrical shape of revolution of a first diameter, and the clipping portion of the male part comprises a cylindrical shape of revolution of a second diameter greater than the first diameter and delimiting a shoulder oriented towards the first part. Preferably, the guide portion of the female part may comprise a bore sized to receive the guide portion of the male part and/or the clipping portion of the female part may comprise at least one arm provided with a finger intended to cooperate with the shoulder of the male part and to form an axial stop for the male part.

A connecting device according to the invention may include a chamfer between the guide portion of the male part and the clipping portion of the male part, and/or the finger may include an insertion edge, opposite an abutment face intended to come into contact with a shoulder, or the second shoulder, intended to cooperate with said chamfer to facilitate the separation of the at least one finger from the first direction in the second direction.

Advantageously, the dimension of the guide portion of the male part in the first direction is such that it enters the bore of the female part before the clipping portion of the male part begins to cooperate with the clipping portion of the female part. According to an additional characteristic, the bore comprises a bottom, the distance between the bottom of the bore and the axial abutment faces of the fingers being preferably greater than the distance between the free end of the guide portion of the male part and the shoulder. The bottom of the bore can form an axial stop for the free end of the guide portion of the male part in the direction of insertion of the male part into the female part.

In an exemplary embodiment, the clipping portion of the female part may comprise two arms each provided with a finger intended to cooperate with the shoulder of the male part and to form an axial stop for the male part, said arms being diametrically opposed example.

According to another additional characteristic, the male part comprises a connecting portion between the clipping portion and the first part, the diameter of which is equal to the first diameter.

The male part and the female part are advantageously made of the same material, advantageously of plastic material, for example chosen from polyphenylene sulfide (PPS), the family of polyaryletherketones (PAEK), the family of polyethersulfones (PESU), polyetheretherketone ( PEEK) and polyphthalamide (PPA).

Another object of the present application is a method of assembling a first part and a second part by means of the connecting device according to the invention, as described above or in the remainder of this application, the first part comprising the male part and the second part comprising the female part, comprising:

- alignment of the male part and the female part in the first direction,

- insertion of the male part into the female part by relative movement along the first direction and cooperation of the guide portion of the male part and the guide portion of the female part, then

- clipping by cooperation of the clipping portion of the male part with the clipping portion of the female part until the male part is retained axially in the female part in a direction opposite to the direction of insertion, the cooperation of the guide portion of the male part and the guide portion of the female part continuing during the clipping phase. Another object of the present application is a hydraulic distributor comprising an electromagnetic actuator, a first piston cooperating with a piston seat, and at least one connecting device according to the invention between the first piston and a rod integral with the core at least in the first direction.

The distributor may be a 3/2 distributor, comprising a second piston secured to the first piston in the first direction, the first piston and the second piston being aligned in the first direction.

The first piston and the second piston can be integral.

Another object of the present application is a hydraulic circuit comprising at least one hydraulic distributor according to the invention and a source of fluid connected to the hydraulic distributor.

Another object of the present application is a motor vehicle cooling circuit with at least one hydraulic distributor according to the invention and a source of cooling fluid connected to the hydraulic distributor.

BRIEF DESCRIPTION OF DRAWINGS

The present invention will be better understood on the basis of the following description and the appended drawings in which:

[Fig. 1] is a longitudinal sectional view of an example of a 3/2 hydraulic distributor implementing a connection device according to an example embodiment,

[Fig. 2] is an enlarged view of the connecting device implemented in the dispenser of Figure 1,

[Fig. 3] is a side view of the male part of the connecting device of Figure 2 shown alone,

[Fig. 4] is a perspective view of the female part of the connecting device of Figure 2 shown alone,

[Fig. 5] is a longitudinal sectional view of the female part,

[Fig. 6A]

[Fig. 6B] [Fig. 6C] are views representing different phases of the assembly process using the connection device of FIG. 2,

[Fig. 7] is a view in longitudinal section of another example of a 3/2 hydraulic distributor implementing a connecting device according to an example embodiment.

DETAILED DISCUSSION OF PARTICULAR EMBODIMENTS

In the following description, the terms “upstream” and “downstream” are considered with respect to the direction of insertion of the male part into the female part.

The connecting device D according to the invention is intended to join together two parts. In the following description, the connecting device D will be described more particularly as a connecting device between a moving assembly of a distributor and an electromagnetic actuator of the distributor represented in FIG. 1. It will be understood that the connecting device according to The invention can ensure the mechanical connection between all parts intended to slide along a first direction.

In this non-limiting example, the distributor is a 3/2 distributor comprising a hydraulic part 2 and an electromagnetic actuation part 4.

The hydraulic part 2 comprises a body provided with an inlet 8 and two outlets 10, 12 and a movable assembly 14 intended to direct the fluid from the inlet 8 towards one or the other of the outlets 10, 12. inlet 8 and the two outlets 10, 12 are connected to a channel 16 in which the mobile assembly is mounted to slide along a first direction Z. The channel 16 may comprise two valve seats 18, 20 and the mobile assembly 14 comprises two shutters or pistons 22, 24 arranged on the mobile assembly and with respect to the seats 18, 20, so that the shutter 22 can come to bear against the valve seat 18, and the shutter 24 can come into contact with the valve seat 20 alternately. Depending on the axial position of the mobile assembly 14 in the channel 16, either the piston 22 can bear against the valve seat 18 and the fluid circulates from the inlet to the outlet 12, or the piston 24 can be in bearing against the valve seat 20 and the fluid flows from the inlet 8 to the outlet 10. In this example, the mobile assembly 14 is in one piece. In this example, the valve seat 20 is an added piece. Mobile assembly 14 may be mechanically connected to an electromagnetic actuator 28 comprising a core 30 mounted in a coil 32. The core 30 is preferably adapted to move axially along the first direction Z in the coil 32 when a current the crossing. The core 30 can be integral in movement with the movable assembly 14 along the first direction Z. In this example the axial attachment of the core and the movable assembly is obtained by a rod 34 connected by a first end 34.1 to the core 30 and by a second end 34.2 to the moving assembly.

In this example, the end 34.2 of the rod 34 is connected to the movable assembly 14 by the connecting device D, the details of which can be seen in FIGS. 2 to 6C.

The connecting device D (figure 2) comprises a male part M (figure 3) formed by the first end of the rod 34 and a female part F (figures 4 and 5) formed by a longitudinal end of the mobile assembly 14.

In the embodiment of FIG. 3, a side view of the male part M can be seen. The male part M extends along an axis Z1. The male part M preferably comprises three portions distributed along the axis Zl:

-a guide portion PI,

- a clipping portion P2,

-a connecting portion P3 connecting the male part M to one of the parts to be connected, in this case the rod 34.

The guide portion PI is located at the free end of the male part M and the clipping portion P2 is located upstream of the guide portion PI in the direction of insertion of the male part into the female part.

PI guide portion is for example of cylindrical shape of revolution of diameter Dl. The clipping portion P2 also has, for example, also a generally cylindrical shape with a diameter D2, D2 being greater than D1. In this example, a first shoulder 36 connects the guide portion PI and the clipping portion P2. Very advantageously, the clipping portion P2 comprises a chamfer 40 bordering the first shoulder 36, the chamfer 40 tapering in the direction of the guide portion PI. Alternatively, the first shoulder 36 is replaced by a chamfer which directly connects the diameter of the guide portion PI and the diameter of the clipping portion P2.

The connecting portion P3 can also have a generally cylindrical shape of revolution of diameter D3, D3 being less than D2. Thus a second shoulder 38 connects the clipping portion P2 and the connecting portion P3. In the example shown and preferably, DI is equal to D3.

The female part F extends along an axis Z2. The female part F comprises a clipping portion P4 and a guide portion P5 disposed axially downstream of the clipping portion P4 in the direction of insertion of the male part into the female part.

The guide portion P5, which connects the clipping portion P4 and the other part to be connected, in this case the movable assembly 14, comprises in this example a non-through bore 42 of axis Z2 and opening at one end into a face 44 facing the clipping portion P4. The diameter of the bore 42 is for example close to that of the guide portion of the male part to allow it to slide with little clearance. Preferably, the clearance to the diameter is between 0 μm and 40 μm according to the ISO H8h7 tolerance for a standard Shaft in Bore assembly.

The clipping portion P4 may comprise two arms 46 extending axially from the face 44 and preferably arranged diametrically opposite in the second direction Y normal to the direction Z. The arms 46 may each comprise at their free end 46.1 a finger 48 extending radially in the direction of the axis ZI and intended to cooperate with the second shoulder 38 of the male part M to form an axial stop for the male part M.

The free end of each finger 48 preferably includes a concave face 50 with a radius of curvature equal to or close to the radius of the guide portion PI and of the connecting portion P3 to surround the connecting portion P3 after clipping. In addition, the concave faces 50 can advantageously comprise an insertion edge 52 inclined towards the axis Z2 in the direction of insertion of the male part into the female part and advantageously cooperating with the chamfer 40 facilitating clipping. Thanks to the guidance obtained by the cooperation of the guide portions PI and P5, a single arm can be implemented. According to another variant, more than two arms are implemented evenly distributed around the axis Z2.

Preferably, the distance between the free end of the male part M and the second shoulder 38 is less, or slightly less, than the distance between the bottom of the bore 42 and the abutment faces carried by the fingers 48, so as to guarantee, at the end of the clipping step, that the fingers 48 are well positioned downstream of the second shoulder 38 and that the arms resume a substantially undeformed shape while limiting the axial displacement between the male part and the female part . The clearance tolerance between the distance between the free end of the male part M and the second shoulder 38 is for example slightly less than the distance between the bottom of the bore 42 and the abutment faces carried by the fingers 48; it can be between 0 pm and 80 pm.

In addition, the length of the guide portion PI of the male part is such that it penetrates the bore of the female part, before the clipping portion P2 of the male part begins to cooperate with the clipping portion P4 of the female part. Thus, during the clipping action, the male part M is guided into the female part F, which facilitates assembly. In addition, keeping the male part aligned with the female part makes the connection more robust, otherwise the male part could separate from the female part under the application of a force in the X direction transverse to the arms (Y direction) and the Z axis.

The assembly of the female part and the male part will now be described with the aid of FIGS. 6A to 6B.

The male part M and the female part F are brought together by aligning the axes ZI and Z2, the guide portion PI of the male part sliding between the fingers 48 of the arms 46 of the female part (FIG. 6A ).

Then the guide portion PI of the male part enters the bore 42. The clipping portion P2 of the male part comes into contact with the fingers, more particularly the chamfer 40 meets the insertion edges 52 carried by the ends radially interior of the fingers 48, which causes the fingers 48 to move apart in the Y direction by elastic deformation of the arms 46. Due to the cooperation of the PI guide portion and the bore 42, the male part M remains aligned with the female part F, avoiding any risk of tilting between the two parts and facilitating assembly.

The clipping portion P2 slides on the radially inner end of the fingers 48. When the male part M has penetrated sufficiently into the female part F, the clipping portion P2 is located downstream of the fingers 48, the arms 46 return to their position not deformed and the fingers 48 cooperate with the second shoulder 38 to form an axial stop. As indicated above, the distance between the free end of the male part M and the second shoulder 38 is preferably less, or slightly less, than the distance between the bottom of the bore 42 and the abutment faces carried by the fingers 48, so as to ensure that the fingers are properly positioned downstream of the second shoulder 38 and that the arms 46 resume a substantially undeformed shape while limiting the axial displacement between the male part and the female part.

In the example shown, the downstream sliding of the male part M in the female part F is limited by the contact between the free end of the guide portion PI and the bottom of the bore 42. Alternatively, this sliding is limited by the pressing of the fingers against a shoulder formed between the connecting portion P3 and the rod 34. According to another variant, the first shoulder 36 between the guide portion PI and the clipping portion P2 is arranged axially so as to bear against the face 44 of the female part 44, limiting the downstream sliding of the male part M in the female part F.

The connection device D by axial assembly also has the advantage of not requiring a through bore unlike the clipping devices of the state of the art made by pressure injection and/or without a machining step, which makes it possible to assemble end to end by clipping two parts extending axially.

Preferably, the male part M and the female part F are made of the same material, which makes it possible to obtain an assembly which does not change as a function of temperature. Alternatively, the male part and the female part are made of materials having thermal expansion coefficients that are close or equal.

Preferably, the material(s) chosen is or are little or not deformable on bending and exhibit low elasto-plastic deformations. For example materials have a breaking strain of about 2% and a Young's modulus of about 12000 MPa.

Advantageously the male part and the female part are made of plastic material, preferably by molding, preferably by plastic injection. The plastic material is preferably polyphenylene sulfide (PPS). As a variant, it can be chosen from the family of polyethersulfones (PESU), the family of polyaryletherketones (PAEK), polyetheretherketone (PEEK) and polyphthalamide (PPA).

We will now describe more particularly the invention applied to the manufacture of the 3/2 distributor, of Figure 1.

The connecting device according to the invention is particularly suitable for connecting the core 30 of an electromagnetic actuator to a piston or a moving assembly carrying two pistons.

In this example, the core is secured in the Z direction to the mobile assembly 14 by the rod 34 which is itself secured in the Z direction with, on the one hand, the core and, on the other hand, the moving crew 14.

The core has a tubular shape through which a bore 58 passes.

For example, the rod 34 comprises at its first longitudinal end 34.1 clipping means (not shown) ensuring the joining of the rod 34 and the core 34 and at a second longitudinal end 34.2 the male part M of the connecting device of the figures 2 and 3.

The clipping means may comprise two lugs parallel to the axis of the rod 34 and provided at their free end with outward radial extensions. During the assembly of the rod 34 and the core, the lugs penetrate through one end of a bore formed in the core by approaching each other by elastic deformation, the rod 34 is moved axially in the bore until the radial extensions of legs emerge from the bore, allowing the legs to return to their initial shape and to ensure, with the radial extensions, an axial connection of the core and the rod. After this assembly has taken place, the rod 34 and the core are placed in the body of the actuator, for this the second end 34.2 carrying the male part M is introduced into the body of the actuator and passes through a seal 65 mounted between a casing 67 of the actuator and a part 66 which closes the magnetic loop. Part 66 forms a seat for seal 65 and also provides the seat function for a spring 68 interposed between the core and part 66. Spring 68 is intended to serve as a return spring and is stressed in compression.

Thanks to the circular cross-section of the connecting device D and of the rod 34, the seal 65 is not damaged by the passage of the male part of the connecting device.

The casing 72 is then mounted around the male part M and is fixed, for example welded, to the casing 67 of the actuator.

The moving assembly 14 comprises at a first longitudinal end the female part of the connecting device.

The mobile assembly 14 is fixed to the rod 34 according to the steps described above, the female part F carried by the mobile assembly 14 is approached axially from the male part M carried by the rod 34 until the fingers bear against the second shoulder 38 of the clipping portion P2 of the male part M.

The piston 22 cooperates with the seat 18 carried by the casing 72, which ensures that the movable assembly is held in position aligned along the axis Z thanks to the return force of the spring and of the link D operating in traction during assembly.

Then the second casing 74 is fixed, for example welded to the first casing 72.

The manufacture of the dispenser of Figure 1 is complete.

In FIG. 7, one can see a second embodiment of a hydraulic distributor comprising a connecting device D according to the invention, in which the moving assembly is in two parts: the piston 20 and the piston 22. Their assembly takes place during the manufacture of the dispenser.

An example of an assembly process for this dispenser is described below.

The first piston 22 comprises at a first longitudinal end the female part F of the connecting device. In this example, the first piston 22 is configured to be connected to a second piston 24, its second end is then provided for connection to another piston. The first piston 22 is fixed to the rod 34 according to the steps described above, the female part F carried by the first piston 22 is approached axially from the male part M carried by the rod 34 until the fingers come into bearing against the shoulder of the clipping portion P2.

When assembling the distributor, after securing the core to the first piston via rod 34, housing 72 is mounted around first piston 22 and is fixed, for example welded, to housing 67 of the actuator. Then the second piston 24 is secured to the second end of the first piston 22, for example by clipping. For example, the first piston 22 is extended by a rod 76 provided with a head 77 of greater diameter than that of the rod 76, the head 77 defining with the rod a first shoulder 78. The second piston 24 is crossed by a passage 80 and is provided, on the face opposite that facing the first piston 22, with lugs 82 extending axially in the extension of the passage 80 and the free ends of which are intended to cooperate with the shoulder 78 by clipping. In addition, the rod 76 includes a second shoulder 84 downstream of the shoulder 78 in the direction of insertion of the piston on the rod 76 and facing the first shoulder 78. The axial position of the second shoulder is chosen so as to come bearing against an axial end 86 of the second piston 24 on the face opposite that bearing the lugs 82. The cooperation of the lugs and the first shoulder and the support of the axial end 86 and the second shoulder 84 ensure the axial immobilization of the second piston with respect to the first piston. As a variant, the second shoulder 84 is replaced by other clipping means cooperating with the axial end 86.

The assembly operation of the second piston on the first piston is carried out as follows:

Head 77 enters second piston 24, exits passage 80, slides between lugs 82 which it deforms elastically. The head 77 slides between the tabs 82 until it escapes from them. The lugs 82 return to their undeformed position and come to bear against the shoulder 78. Simultaneously the axial end 86 of the second piston 24 comes to bear against the second shoulder 84 of the first piston ensuring an axial immobilization of the second piston 24 on the first plunger 22. This assembly is also facilitated by the aligned position of the first piston. This assembly offers very good resistance because the tabs are then stressed in compression by the hydraulic pressure which is exerted on the second piston downwards in the representation of FIG. 1. Then the second casing 74 is fixed, for example welded to the first casing 72.

In the description above the male part is carried by a rod. It will be understood that this can be carried by any part having a different shape. It is the same with the female part.

Advantageously, means (not shown) can be provided to immobilize the first piston in rotation around the axis Z relative to the rod 34 and the second piston relative to the first piston.

The connecting device according to the invention can be applied to the assembly of all parts in an axial direction requiring increased tensile and compressive strength. The connecting device is suitable for the manufacture of any type of valve, in particular solenoid valves and any type of distributor. It is suitable for hydraulic circuits, in particular in the automotive field and more particularly for cooling circuits for the automotive field.

Claims

1. Connecting device between a first part and a second part intended to be stressed in a first direction (Z) comprising:

- a male part (M) intended to be integral with the first part and a female part (F) intended to be integral with the second part, the male part (M) being intended to be inserted into the female part (F) the along the first direction (Z),

- the male part (M) comprising at least one guide portion (PI) and a clipping portion (P2), the guide portion (PI) being arranged downstream of the clipping part (P2) in the direction of inserting the male part (M) into the female part (F),

- the female part (F) comprising a guide portion (P5) and a clipping portion (P4), the guide portion (P5) being arranged downstream of the clipping part (P4) in the direction of insertion of the male part (M) in the female part (F),

- the male part (M) and the female part (F) being configured so that the guide portions (PI, P5) cooperate with each other and provide guidance in the first direction of the male part (M) before the clipping portions (P2, P4) cooperate with each other.

2. Connecting device according to claim 1, comprising a first shoulder (36) which connects the guide portion (PI) of the male part (M) and the clipping portion (P2) of the male part (M).

3. Connecting device according to claim 2, wherein the clipping portion (P2) of the male part (M) comprises a chamfer (40) bordering the first shoulder (36), the chamfer (40) narrowing in the direction of the guide portion (PI) of the male part (M).

4. Connecting device according to claim 1, comprising a chamfer (40) which directly connects the guide portion (PI), or its diameter, and the clipping portion (P2), or its diameter.

5. Connecting device according to one of claims there 4, wherein the guide portion (PI) of the male part (M) has a cylindrical shape of revolution of a first diameter, and the clipping portion (P2) of the male part (M) comprises a cylindrical shape of revolution of second diameter greater than the first diameter and delimiting a shoulder (38), or a second shoulder (38), oriented towards the first part, and in which the guide portion (P5) of the female part comprises a bore (42) sized to receive the guide portion (PI ) of the male part and the clipping portion (P4) of the female part (F) comprises at least one arm (46) provided with a finger (48) intended to cooperate with the shoulder (38) of the male part (M) and to form an axial stop for the male part (M).

6. Connecting device according to one of claims 1 to 5, comprising a chamfer (40) between the guide portion (PI) of the male part (M) and the clipping portion (P2) of the male part, and wherein the finger (48) has an insertion edge (52), opposite an abutment face intended to come into contact with a shoulder (38), or with the second shoulder (38), intended to cooperate with said chamfer (40) to facilitate the separation of the at least one finger (48) from the first direction (Z) in the second direction (Y).

7. Connecting device according to claim 1 to 6, in which the dimension of the guide portion (PI) of the male part (M) in the first direction (Z) is such that it enters a bore (42) , or in the bore (42), of the female part (F) before the clipping portion (P2) of the male part (M) begins to cooperate with the clipping portion (P4) of the female part (F ).

8. Connecting device according to claim 5, 6 or 7 in combination with claim 6, in which the bore (42) has a bottom, the distance between the bottom of the bore (52) and the axial abutment faces fingers (48) is greater than the distance between the free end of the guide portion (PI) of the male part and the shoulder (38).

9. Connecting device according to claim 8, wherein the bottom of the bore (52) forms an axial stop for the free end of the guide portion (PI) of the male part (M) in the direction of inserting the male part (M) into the female part (F).

10. Connecting device according to one of claims 1 to 9, wherein the clipping portion (P4) of the female part (F) comprises two arms (46) each provided with a finger (48) intended to cooperate with a shoulder (38), or with the second shoulder, of the male part (M) and to form an axial stop for the male part (M), said arms (46) being diametrically opposed.

11. Connecting device according to one of claims 1 to 10, wherein the male part (M) comprises a connecting portion (P3) between the clipping portion (P2) and the first part whose diameter is equal to the first diameter.

12. Connecting device according to one of claims 1 to 11, wherein the male part (M) and the female part (F) are made of the same material, advantageously plastic, for example chosen from polyphenylene sulphide (PPS), the polyaryletherketone family (PAEK), the polyethersulfone family (PESU), polyetheretherketone (PEEK) and polyphthalamide (PPA).

13. A method of assembling a first part and a second part by means of the connecting device according to one of the preceding claims, the first part comprising the male part (M) and the second part comprising the female part ( F), including:

- alignment of the male part and the female part in the first direction (Z),

- insertion of the male part into the female part by relative movement along the first direction and cooperation of the guide portion (PI) of the male part and the guide portion (P5) of the female part, then

- clipping by cooperation of the clipping portion of the male part with the clipping portion of the female part until the male part is retained axially in the female part in a direction opposite to the direction of insertion, the cooperation of the guide portion (PI) of the male part and the guide portion (P5) of the female part continuing during the clipping phase.

14. Hydraulic distributor comprising an electromagnetic actuator, a first piston (22) cooperating with a piston seat, and at least one connecting device according to one of claims 1 to 12 between the first piston (22) and a rod integral with the core at least in the first direction.

15. Distributor according to the preceding claim, being a 3/2 distributor, comprising a second piston (24) integral with the first piston (22) in the first direction (Z), the first piston (22) and the second piston (24) being aligned in the first direction (Z).

16. Dispenser according to the preceding claim, wherein the first piston (22) and the second piston (24) are integral.

17. Hydraulic circuit comprising at least one hydraulic distributor according to one of claims 14 to 16 and a source of fluid connected to the hydraulic distributor.

18. Cooling circuit for a motor vehicle at least one hydraulic distributor according to one of claims 14 to 16 and a source of cooling fluid connected to the hydraulic distributor.